h it until he found the
sliding sleeve that shut off the blast.

"All right," he called to Gor. "Bring on your men; we've got to clean
up this place and get rid of the bodies before the sun gets in its
work. They're the ones that will go into the ocean instead of you." He
moved carefully along the straggling line of bodies, salvaging the
weapons and turning off their fearful blasts.

They worked and slept and worked again before their gruesome task was
done and Rawson was ready to begin the other work that he had in mind.

Beside the mouth of the great shaft, resting on the rocks, was a
cylinder, almost exactly a counterpart of the one Loah had used. But
this was larger--fully fifty of the red savages could have crowded
inside.

"It is the only one they had," said Loah. "I have seen, and I know."

"But they can make more," Gor argued. "This one and the one we have,"
he told Rawson, "were made thousands of years ago. There were masters
of metal-work among them, and they had learned to use Oro and Grah.
Even then the people were divided. He who was then Gor and his
followers fought with the others. But he left them one _jana_--this
very one here. Then Gor followed the Pathway to the Light, though he
sealed it as you know. But--but they will build others. Sooner or
later they will come."

"I think not," said Rawson. "Now what about this Oro and Grah
material? What was it you called them--the Sun-stone and the
Stone-that-loves-the-dark? I must know how they work." But Loah was
reluctant to experiment with the _jana_ of the Reds; she had her own
shell brought instead--and then Rawson learned the secret of what
seemed its miraculous flight.

A cylindrical metal bubble, just buoyant enough to lift itself above
the ground--Gor and some of the others brought it from the village.
Gor brought, too, a little box which he carried with great difficulty.

* * * * *

"It is Grah," he said, when he showed Rawson a little scattering of
black dust within the box. "Always it tries to fall back under the
ground. Both Oro and Grah grow deep down near the Zone of the Fires;
we find them in the caves, Oro on one side and Grah on the other. Oro
is as heavy in its upward falling as Grah is in its downward.

"Then"--he pointed to the central vertical tube in the shell--"we put
both of them in here, bringing it a few grains at a time. One falls to
one end and the other to the other. And then, with these s